Collapsible wheel structure for a luggage box

Abstract

A collapsible wheel structure for a luggage box includes a wheel base and a foldable rod. The wheel base is pivotally connected with a wheel. One end of the wheel base is pivotally connected to the foldable rod. The foldable rod is pivotally connected to the wheel base for connecting with the wheel base firmly. When the wheel base and the foldable rod are unlocked, the foldable rod is in a folded status. The collapsible wheel structure is adapted to couple with the bottom of the luggage box. When the foldable rod is in a folded status, the size of the luggage will be reduced.

What is claimed is: 
     
       1. A collapsible wheel structure for a luggage box, comprising a wheel base and a foldable rod, and characterized by:
 the wheel base comprising a support and a wheel, the wheel being pivotally connected to the support, one end of the wheel base being pivotally connected to the foldable rod; 
 the foldable rod having a pivot portion which is pivotally connected to the support of the wheel base, the foldable rod being coupled with a buckle unit to control engagement and disengagement of the foldable rod and the wheel base, wherein the buckle unit comprises a buckle member, a loop and a fixing plate, the foldable rod has a concave trough corresponding in position to the buckle unit, the loop of the buckle unit is secured between the fixing plate and the buckle member, and the fixing plate is firmly connected to the buckle member with a screw and a protruding portion of the buckle member; 
 thereby, the collapsible wheel structure being coupled to a bottom of a soft bag of the luggage box, when the luggage box is in use, the foldable rod being unfolded to hold the bottom of the soft bag of the luggage box, when the luggage box is not in use, the foldable rod being folded to compress the soft bag of the luggage box so as to reduce the size of the soft bag. 
 
     
     
       2. The collapsible wheel structure for a luggage box as claimed in  claim 1 , wherein the support of the wheel base has an L shape. 
     
     
       3. The collapsible wheel structure for a luggage box as claimed in  claim 1 , wherein the wheel base has an outer side formed with a protrusion and an engaging recess, a pin penetrates the wheel base to connect the wheel base and the foldable rod. 
     
     
       4. The collapsible wheel structure for a luggage box as claimed in  claim 1 , wherein another end of the foldable rod is provided with a foot pad. 
     
     
       5. The collapsible wheel structure for a luggage box as claimed in  claim 1 , wherein the wheel base and the foldable rod are provided with a plurality of coupling portions.